JPS627531Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fusing device for plastic film for packaging which is incorporated into a so-called hand wrapper or the like.

[Prior Art] Conventionally, handle wrappers have been used to wrap foods such as vegetables and fish, and trays and other items containing them, with plastic packaging films, as shown in Figure 6. A film fusing device 72 that cuts the plastic film 71a pulled out from the packaging 71 to package the article F at an appropriate point _P1 , and a welding device 7 that thermally welds the overlapping portion _P2 of the film 71a wrapped around the article F.
3. In this hand wrapper, a suitable point _P1 to be cut on the film 71a is brought into pressure contact with the film fusing device 72, and the film 71a is melted by the thermal melting action of the film fusing device 72, and then, The overlapping portion _P2 of the cut film 71a at the bottom of the article F is welded by a welding device 73, so that the article F is packaged.

By the way, in such a handler,
As shown in FIG. 7, the film fusing device may be constructed from a single heater wire 74, or as shown in FIG.
There is one constructed by inserting it into the inside of 6.

However, in the former case, the film 71
There is a disadvantage that the heater wire 74 is easily broken due to the pressure contact action of a, and in the latter case, since the heater wire 75 is surrounded by the blade body 76, the blade body 7
6, the temperature rise time is slow, and the blade body 76 must be preheated by the heater wire 75, resulting in a large amount of power consumption.

[Object of the invention] Accordingly, an object of the invention is to provide a fusing device for plastic film for packaging that can prevent damage such as wire breakage and reduce power consumption.

[Summary of the invention] The invention consists of a support base and a large number of dot-shaped film resistors attached to the surface of a long support member provided on the support base, and a method for supplying current to the film resistors. a heating element that fuses the plastic film by pressing the plastic film against the film resistor while the film is in contact with the film; It is equipped with a heater switch, and
It is characterized by high mechanical strength and rapid temperature rise.

[Embodiment] An embodiment in which the present invention is applied to a handler will be described below with reference to FIGS. 1 to 5.
First, in FIG. 1, the general structure of the handler par is described. Reference numeral 1 denotes a hollow box-shaped main body, which corresponds to a support base of a fusing device 21 to be described later. A flat base portion 1a is formed in the front portion of the main body 1. 2, 2 are rollers rotatably provided at the inner rear part of the main body 1;
A film wrapping body 4 made of a long self-adhesive plastic film 3 for packaging is placed thereon. Reference numeral 5 denotes a power distribution box disposed slightly in the front of the main body 1, and 6 a lid rotatably provided on the rear upper surface of the main body 1 so as to cover the film wrapping body 4.
The lower part of the front edge 6a of the lid 6 is a lead-out part 7 for leading the film 3 outward.
As shown in FIG. 2, two rollers 9 and 10 are rotatably provided in this lead-out portion 7 via support pieces 8 and 8 extending to the power distribution box 5. 1
Reference numeral 1 denotes a rotating plate, which is located in front of the lead-out portion 7 and is pivotably provided via a pivot piece 11a and a shaft 12. A contact piece 13 is bent at the rear edge of the rotary plate 11, and a molded cloth 14 that prevents the film 3 from coming into close contact with the rear surface of the contact piece 13 is attached. ing. Further, a storage case 16 forming a storage chamber 15 inside is bent at the front of the rotating plate 11, and an opening 17 is formed in the upper surface of the storage case 16. 18 is a coil spring, which is the rotating plate 11
As a result, the abutting piece 13 of the rotating plate 11
is brought into pressure contact with the roller 9 via the cloth 14. 1
Reference numeral 9 denotes a stopper, which is mounted inside the main body 1 so as to come into contact with the pivot piece 11a of the rotating plate 11, and this stopper 19 prevents the rotating plate 11 from rotating in the opposite direction of arrow A. The movement limit position is determined.
The film 3 is passed between the roller 9 and the cloth 14 and led out from the lead-out portion 7, and when it is cut by a cutting device 21 (to be described later), the film 3 is self-adhesive and is drawn out as shown in FIG. As shown in FIG.
It is in close contact with the top surface of the Further, in the state shown in FIG. 2, when the film 3 is peeled off from the rotating plate 11 and pulled upward from the lead-out portion 7 within the angular range indicated by B in the figure, the film 3 is separated from the rotating plate 11.
Since it is in a non-contact state with the upper surface of the contact piece part 13,
The film 3 is pulled out smoothly without rotating the rotary plate 11. If the film 3 is pulled out at an angle within the angle range indicated by C in the figure, the film 3 is the rotating plate 11
The rotating plate 11 is rotated in the direction opposite to the arrow A because the rotating plate 11 comes into close contact with the upper surface of the abutting piece 13. On the other hand, 20 is the base portion 1a of the main body 1.
This is the welded state in which it was installed.

Now, 21 is a fusing device related to the present invention,
This will be explained below with reference to FIGS. 2 to 5. Reference numeral 22 denotes a pair of pillars, which are attached to both left and right sides of the power distribution box 5 (only one is shown). 23 is a heating element, which is a pair of supports 22
A main body 1 is installed between the
is provided via a support 22. The heating body 23 is normally housed in the housing case 16 of the rotating plate 11. Therefore,
The heating body 23 is relatively exposed upward from the opening 17 of the storage case 16 when the rotating plate 11 is rotated in the direction opposite to arrow A and the storage case 16 is displaced downward. 24 is a micro switch which is a heater switch, and this is connected to the support 22.
The micro switch 24 is arranged so as to be located below the storage case 16 of the rotating plate 11, and this micro switch 24 is arranged so that when the rotating plate 11 rotates in the opposite direction of arrow A, the actuator 24a moves toward the storage case 16. 16 is turned on by being pressed by the lower surface. That is,
When the film 3 is lowered in the direction of the arrow D in order to press (melt) an appropriate point _P1 of the film 3 onto the heating element 23 as shown by the two-dot chain line in FIG. As a result, the micro switch 24 is turned on in connection with the pressing operation of the film 3. Here, the configuration of the heating element 23 will be described in detail. As shown in FIGS.
6, a conductive part 27 and a protective layer 28. The support member 25 is constructed by covering a horizontally elongated steel plate substrate 29 with an enameled layer 30. In the substrate 29, a cut portion 29a having a substantially arc-shaped cross section is formed by bending so as to extend in the left-right direction.
A large number of through holes 31 are arranged in rows in the left-right direction. The enamel layer 30 is also continuously coated on the inner surface of the through hole 31. The conductive part 2
Reference numeral 7 is for energizing the film resistor, and this is introduced into the through hole 31 from the lower surface of the cut portion 29a.
The film resistor 26 is made of, for example, a carbon-resin printed resistor, and has a dotted shape. The film resistor 26 is fixed to the support member 25 so that the cut portion 29a of the substrate 29 is continuous with the conductive portion 27. The protective layer 28 is made of electrically insulating ceramic or the like and is made thin in order to reduce the heat capacity, and is similar to the film resistor 2.
It is formed to cover 6. On the other hand, in FIG. 2, inside the power distribution box 5 is a circuit case 32.
Although not shown in the circuit case 32, an impulse supply circuit that intermittently supplies an impulse current to the film resistor 26 based on the turning on of the microswitch 24 is housed inside the circuit case 32. Note that 33 is a setting knob for setting the impulse width, and 34 in FIG. 1 is a power switch.

In this embodiment configured as described above, as shown by the _two -dot chain line in FIG. Lower it. Then, as described above, since the rotating plate 11 is rotated in the opposite direction of arrow A, the micro switch 24 is turned on at the rotating position shown in FIG. An impulse current is applied intermittently, and the film resistor 26 instantly rises to a predetermined temperature.
6 is rotated downward, as mentioned above,
The upper end of the heating body 23, that is, the film resistor 26 is exposed, and the film 3 is pressed against the exposed film resistor 26, so that an appropriate location _P1 of the film 3 is subjected to the thermal action of the film resistor 26. It will be fused. This thermal effect is intermittently applied to the film 3 due to the intermittent presence of the film resistor 26, but a continuous fusing effect is obtained due to thermal diffusion. In this case, by pulling the film 3, it is possible to cut it without waiting for heat diffusion. It should be noted that before or immediately after this melt-cutting time, the film 3 on the lead-out portion 7 side comes into contact with the upper surface of the abutment piece portion 13 of the rotary plate 11 and the upper surface of the storage case 16, and is brought into close contact with the upper surface of the storage case 16 in a bridging state. After this fusing, the film 3 in article F
The overlapping portions are welded using a welding device 20.

According to this embodiment with the above configuration, the following effects can be obtained. That is, since a large number of film resistors 26 are attached to the support member 25 to increase the mechanical strength of the heating element 23 itself, even when the film 3 is pressed against the heating element 23, the resistance as shown in FIG. Unlike the conventional method, damage accidents such as wire breakage can be eliminated. Moreover, since the film resistor 26 is formed in a dot shape to reduce the contact area of the film resistor 26 with the support member 25, when the film resistor 26 generates heat, the support member 25 The amount of heat transfer (heat loss) to the film resistor 26 can be reduced, and the temperature of the film resistor 26 can be increased accordingly.Therefore, unlike the conventional method shown in FIG. 8, there is no need for residual heat.
Moreover, the film resistor 26 can be brought into direct contact with the film 3, and as a whole, the film 3 can be melted and cut quickly. Here, the reason why the film resistor 26 is formed in a dot shape is as follows. That is,
It has been known for some time that when plastic film is cut by melting, it is preferable that the heating element in the heating element be formed into a long and continuous linear shape in accordance with the cutting direction. However, when the heating element is made into a long linear shape, the contact area of the heating element with the support member is large, so the amount of heat transferred from the heating element to the support member (heat loss) is large. As a result, the rise in temperature of the heating element becomes slower.
Considering this point, in this embodiment, the film resistor 26
is formed into a dot shape. And in this case,
The problem is whether or not the plastic film can be effectively fused by forming the film resistor 26 in the form of dots. In this regard, the inventor investigated how the plastic film of the film resistor 26 is fused. The present inventor has found that when the film resistor 26 generates heat, a thermal diffusion effect is exerted on the plastic film. Therefore,
If it has that thermal diffusion effect, the film resistor 26
Even if the structure is arranged intermittently in the form of dots,
Plastic film can be cut continuously in the same way as a continuous linear heating element. In this case, since the actual fusing operation is normally carried out by the operator while pulling the plastic film, it can be expected that the cutting can be done without waiting for the above-mentioned thermal diffusion, and thus the film resistor 26 can be cut into dots. Despite this, sufficient fusing can be achieved. Furthermore, the film resistor 26
Since the micro switch 24 is provided so as to be turned on in connection with the pressing operation of the film 3, the film resistor 26 can be energized only when the film 3 is to be fused, and as a result, power consumption can be greatly reduced. . In this case, since the heating element is constituted by the film resistor 26 which itself generates heat quickly, it is possible to generate so-called dynamic heat intermittently using an impulse current during the power supply to the film resistor 26. , especially film resistor 2
In the case of this embodiment in which an impulse current is applied to the circuit 6, the power consumption can be further reduced.

[Effects of the invention] As is clear from the above description, the present invention includes a support base and a large number of dot-shaped film resistors attached to the surface of a long support member provided on the support base. a heating element which melts the plastic film by pressing the plastic film against the film resistor while the film resistor is energized; The heating element is equipped with a heater switch that energizes the film resistor, thereby increasing the mechanical strength of the heating element, eliminating the risk of damage, and quickly increasing the temperature. In addition, the film resistor can be energized only when the film is to be fused, and the amount of power consumed can be greatly reduced.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a partially cutaway side view of the handler, Figure 2
The figure is an enlarged vertical side view of the main part, Figure 3 is a vertical side view of the main part for explaining the function, Figure 4 is a rear view of the heating element in the fusing device, and Figure 5 is shown along the - line in Figure 4. FIG. FIG. 6 is a schematic partially cutaway side view of a conventional handler par, and FIGS. 7 and 8 are perspective views of different conventional examples of fusing devices. In the figure, 1 is the main body (support base), 3 is a film, 11 is a rotating plate, 21 is a fusing device, 23 is a heating element, 24 is a micro switch (heater switch), 25 is a support member, and 26 is a film resistor. , 28
is a protective layer.

Claims (1)

[Scope of utility model registration request] It is composed of a support base and a large number of dot-shaped film resistors attached to the surface of a long support member provided on the support base. A package comprising: a heating element that melts the film by pressing it against the film; and a heater switch that is turned on in conjunction with the pressing operation of the film and that turns on the heater switch to energize the film resistor. Fusing equipment for plastic film.